HTTP 414 means a server will not process a request because the URL—the request’s target URI—is longer than that server is willing to interpret. The fix depends on what created the long request and which part of the connection returned the error: a client or form, a redirect rule, a proxy, or the web server. Find that cause before increasing a limit.
What does HTTP 414 mean?
The current standardized name is 414 URI Too Long. The IETF’s RFC 9110, Section 15.5.15, defines it this way: “The 414 (URI Too Long) status code indicates that the server is refusing to service the request because the target URI is longer than the server is willing to interpret.” Older software or error pages may instead say “Request-URI Too Long” or “Request-URI Too Large.”
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A URI identifies the requested resource; in a web address, it includes the path and may include a query string after a question mark. The error concerns the request target, not by itself the size of data sent in a request body. A 414 is also not evidence that every URL above a particular length will fail: acceptance depends on the limits of the server and any intermediary handling the request.
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Why am I getting a 414 error?
The HTTP standard describes 414 as rare and identifies several possible situations. The useful first step is to inspect the actual request rather than assume that a URL is simply “too big.”
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- Too much information in a GET URL: A form intended to submit data in a POST body may accidentally submit using GET. The data then appears in the query string, potentially making the request target too long.
- A redirect loop that keeps extending the URL: Repeated redirects can add a path prefix, suffix, or query parameter until the request target exceeds a component’s limit.
- A request that is unusually long or suspicious: The standard lists an attack exploiting potential security holes as another possible situation. That possibility merits investigation when the request is unexplained; it is not a reason to assume an attack in every case.
These scenarios are described in RFC 9110. A long URL may also be an intentional application requirement, so distinguish intended data from accidental URL growth.
How should a visitor deal with a 414?
- Try the site’s intended form, link, or workflow rather than manually reusing a generated URL.
- If the workflow permits, remove unnecessary query parameters and try again. Do not remove parameters that the site needs to complete the action.
- Report the failing page to the site owner, including the URL and what happened before the error—especially whether the browser was redirected repeatedly. Redact credentials, personal information, and private tokens before sharing a URL.
How can a site operator diagnose and fix HTTP 414?
- Reproduce the failure. Record the HTTP method, full path and query string, and the redirect sequence. Compare the failing request with the request the application intended to send.
- Find the hop that returned 414. A browser-facing proxy, CDN, load balancer, web server, or application may enforce its own request-target policy. Check logs and response details across the request path; changing the origin server will not help if an earlier component returned the status.
- Correct how the request is generated. If a form was meant to send data in a POST body but uses GET, correct its method and avoid carrying unnecessary state in the URL.
- Repair redirect behavior. Trace successive locations and stop rules that repeatedly add path or query components.
- Investigate unexplained requests. Review relevant logs and security signals if the request is not explained by the application or redirects. The standard includes an attack scenario, but the status alone does not establish malicious traffic.
- Adjust a limit only when needed. If the request target is intentionally long, consult documentation for the component that actually issued the 414, then validate the configuration and test through the same network path.
What does the 8,000-octet guidance mean?
RFC 9112, Section 3.1 (2022), recommends that HTTP senders and recipients support request lines of at least 8,000 octets. This is a minimum protocol support recommendation, not a guarantee that every browser, proxy, server, or complete deployment path will accept a request of that length. It is not a universal URL character cutoff: URI encoding and the policies of each component affect what can pass.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you change the limit in NGINX?
NGINX documents the large_client_header_buffers directive for setting the maximum number and size of buffers used to read large client request headers. The documented default is large_client_header_buffers 4 8k;. NGINX says a request line must fit within one buffer; if it does not, NGINX returns 414. A request-header field that exceeds one buffer instead results in 400. See the NGINX core module documentation.
The directive is available in http and server contexts. An illustrative configuration shape is large_client_header_buffers 4 16k;, but that is not a universal recommendation or a tested setting. Choose a value based on legitimate request requirements and the deployed NGINX version and configuration. The request-line limit depends on the size of one buffer, not the combined capacity of all buffers; increasing the count alone does not make an individual request line longer. Validate the effective configuration and test through the same proxy and server path that produced the error.
These details apply to NGINX. For a CDN, load balancer, other web server, or application, use the documentation for the component confirmed to have generated the 414; the NGINX directive does not set another product’s limit.
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